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I was looking at the reddish margin to the opercular tab. Or is this just the whitish/clear extension that the GSF has? The picture does not look very red but it was noticeably red in real life. Both pictures are of the same fish.

The local GSF are noticeably shorter in stature than a BG. Less dishpan shape than a BG. They almost take on the overall shape of a LMB.

Another mutt?

Edit: I went looking for more pictures of RES and GSF, and found this artist rendition and description. It says the GSF can have "gill flap is black with a pale-red, pink or yellow edge". I did not realize the GSF could have the pale-red edge to the opercular tab. I think you are right. Pretty green sun-fishy. Although it does not look comnpletely like our native GSF of which I have some in our old pond.
Gallery of Penn fishes

I keep learning.